A group is experimenting with selection in a mouse model for a disease that is lethal in mid-life. After 30 generations of exposure, the population's average life span is near that of a wild-type mouse population. What type of selection did the model mouse population undergo?

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1. A group is experimenting with selection in a mouse model for a disease that is lethal in mid-life. After 30 generations of exposure, the population's average life span is near that of a wild-type mouse population. What type of selection did the model mouse population undergo?